Self-tightening bolt



M. M. MORATTA June 16, 192s. 1,542,467

SELF TIGHTBN'IHG BOLT Filed uarch 1o, 192'4 Y luv yfication.

Patented June 1K6, 1292215..Y l

` MATHEW MQMORA'TTA, or; PR'INCEQDON, ninmNA. 'f

' f i sELrfmieH'rENING' Bom.

i Applicatipnled'rMarch.10, 19.24.A Serial No. 698,292.'

To all 'whom it may concern:

Beit known that I, llIATHnw MZ MORATTA.

a citizen ofthe'United States,"res`idin`g at Princeton,VM in Y the countyof Gibson and 'State'of Indiana, have invented certain new and useful Improvements in *Self-'ligliten-v ing Bolts, of which'the following is a speci- This 4invention appertains to nuts" and bolts for use in connection with bearings and the like and the primary object of this invention is torprovide" an improved automatic take-up nutV and boltfor compensat` y' ing lfor` the wear Von'the 'bearings'."v

Another object ofthe invention isgto provide a selftightening` nut and bolt, which willfalso act as a nutflocktd-prevent theV accidental unthreading ofthenut through vibration, vin case the'l automatic take-up` spring rshould be rendered"inoperatlve for any reason.

A further objectrbr the invention is the provision of an automaticV takefup' nut and boltr embodying a pair of nut sections, threadedly connected together, one of the sections having rigid 'contact with the shank of the bolt, and the other section having threaded Contact with` the shank of the bolt, the sections being resiliently connected to.- gether byV a coiled spring,`which normally tends to unthread the nut sections relative to one another for tightening` up the bolt so as to effectively take up any wear on the bearings.

A still further object of the invention is to provide an improved device of the` above character, which will `be durable and eflicient in use, one that will be simple and easy to manufacture and one which can be placed upon the market at a small cost.

With these and other objects in view, the invention consists in the novel construction, arrangement and'formation of parts, vas will be hereinafter more specifically described, claimed and illustrated in the accompanying drawings, in which drawings:

Figure 1 is a side elevation of an improved take-up nut and bolt` showing the same applied to the Work,

Figure 2 is a top plan View of the same, and ,i

Figure 3 is an enlarged longitudinal section through the take-up nut and bolt showing the same applied to work, the workbeing shown in section.y

Referring to the drawings in y detail,

,whereinsimilar reference characters* designate corresponding parts throughout the 'several views, Vthe letter JA' generally lindicatesthe take-up nut andbolt and B and C the sections of the work whichvcan be con# sidered as companion v bearingl portions.

The work sections B and C are provided. with aligned openings 5.

The .improved take-up nut and bolt comprises lthe boltshank6 having the bolt head 7 formed on one end thereof. The bolt .shank 6 is threaded ,for a vportion vof its length as clearly shown in Figure 3 ofthe drawings. The extreme outeiendA of the shank` Gis left plain as indicated by the .reference character 8 and provided with a diametrically extending opening 9..

An inner nipple nut Ysection 10 andan outer barrel section l11 are provided for receiving the shank 6 of the bolt and the inner Vnipple nut vsection 1() embodies `the body portion 12l which ris `providedawith internal threads 13 forengagingthe threads ofthe bolt and an externally threaded nipple or sleeve 14. The outer barrel section 11 includes a body 15 arranged in spaced parallel relation to the body 12 and a cylindrical sleeve or barrel portion 16 which is internally threaded for receiving the threads formed on the nipple or sleeve portion 14 of the inner nipple nut section 10. The eX- treme outer end of the barrel nut section 11 is provided With a castellated head 17.

A. relatively heavy spring 18 is coiled about the barrel section 11 yand is adapted to be confined between the body portions 12 and 15of thenut sections 10 and 11 and the inner end of the spring is provided with a foot 20 for engaging in an anchoring opening 21 formed in the body 12 of the nipple nut section 10. The outer end of the spring is provided with a hook 22 which is adapted to fit in an inclined slot 23 formed in the body 15 of the barrel nut section 11. A suitable locking cotter key 2a is adapted to pass through the diametrically extending opening 9 formed in the shank 6 for engaging the castellated head 17 of the outer nut section 11, for a purpose which will be hereinafter more fully described.

In use of the improved takeup bolt and nut A, the shank 6 of the bolt is passed through the aligned openings 5 in the work sections Band C and the nipple nut section 10 is threaded on the shank of the bolt inengagement With the Work after Which vInent with the castellated head 17. It is .obvious that as theV bearing Wears, that the vspringl will have a tendency to unwind, Which will tend to spread the sections l and l1 thus effectively tightening up the bolt and maintaining aneven pressure on the bearing or Work` sections B and C.

The device also functions, as a nutY look, and it can be seen that should the spring 18 break that unthreading of the nut sections lO and 1l will be precluded in view of thecotter `pin 24. When the nut and bolt are in use, vibration will be precludedbetween the nut sections and bolt due to the rigid connection between the cotterlpin 24 and the castellated head 17. Y Y

` Changes in detail may be made Without departing from the spirit or the scope of this invention, but what I clainias new is: lIn 'a"iselftightening= nut andv bolt, the

'conibination with "a bolt including a portion andan internally threaded barrel portion arranged to engage the threads of the sleeve portion of the inner nipple nut section, a castellated head formed on the body portion of the outer barrel section, a coil spring coiled about the nut sections 4and between the body portions thereof,

means for anchoring the inner end of the spring to the body portion of the inner nipple nut section, the body portion of the outer barrel nut section having an inclined notch therein, a hook` formed on the outer end oi the spring arranged to detachably engage in said notch, and a Cotterv pin arranged to extend through the opening in the shank of the bolt to engage with the castellate'd, head of vthe outer barrel nut section. y

In testimony whereof I aiiix my signature in presence of two Witnesses.

MATHEVV M. MORATTA. 

